Excessive Distortion in element

Excessive Distortion in element

Dear group

I modeled a filled hole composite plate loaded in tension. I have used in-bulit hashin failure criteria. The maximum force is ok, the strain gauge measurements are fine. however, I get excessive distortion in the elements close to the hole. I am not sure what is causing the excessive distortion. The elements I have used is Continuum shell elements with reduced integration formulation.
Please see the file titled "ExcessiveDistortion.bmp" in the file section of the group.

Please advice on what can cause such distortion. Your help will be much appreciated.

I modeled a filled hole composite plate loaded in tension. I have used in-bulit hashin failure criteria. The maximum force is ok, the strain gauge measurements are fine. however, I get excessive distortion in the elements close to the hole. I am not sure what is causing the excessive distortion. The elements I have used is Continuum shell elements with reduced integration formulation.

Please see the file titled "ExcessiveDistortio n.bmp" in the file section of the group.

Please advice on what can cause such distortion. Your help will be much appreciated.